Question

what happens at a national convention? presidential candidates debate on tv. parties choose their presidential nominees. the president is officially inaugurated.

Explanation:

National political party conventions in the U.S. are formal gatherings where political parties select their official presidential and vice-presidential nominees, along with setting party platforms. TV debates happen separately during the general election campaign, and the presidential inauguration occurs after the election to swear in the winner.

Answer:

Parties choose their presidential nominees.